This guide was
specifically written to assist owners of the GM (General Motors) 2001
Pontiac Grand Prix GTP in resolving problems with the ABS (Anti-Lock Braking
System), "TCS OFF" (Traction Control System) and the SES (Service Engine
Soon) dash board warning lights. I am not a mechanic and this is just an
informal troubleshooting web page. I take no responsibility for damage to
your vehicle, your person, your property or anything else. Consult a GM
Master Technician or ASE (National Institute For Automotive Service
Excellence) Certified mechanic before attempting any repair on your vehicle.

The most obvious symptoms of this
problem are the "ABS" and "TCS OFF" warning lights being lit up on
your dashboard's instrument panel. Other warnings you might see
depending on your vehicle model may include the "SES", "Check Engine",
"Trac Off" or "Service Engine Soon" warning lights.

Then I took the car for a test drive, did some online research,
and realized that the power steering problem was due to the ABS/TCS issue.

Since the vehicle's computer could not read the WSS (wheel speed sensor)
a.k.a. VSS (vehicle speed sensor) in one or more of the
wheel hubs, it disabled the Magnasteer (speed sensitive power steering
feature).

I've also read that on some GM models the computer may also
disable the cruise control feature.

Check for water
in/around the main brake light bulbs, the third brake light and the tail
light sockets common ground which may cause a short.

Check the tires for
extreme pressure differences or deviations from the recommended settings.

Check the battery terminals for corrosion or loose connections.

Finally,
check the ECM (engine control module a.k.a. "ECU" engine control unit,
in the air box), EBCM
(electronic brake control module, under the dash), and EBTCM (electronic
brake traction control module, on the master brake cylinder ABS mount) for
broken connectors or wiring.

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